r -."1 [ 0-217 ^ .-i/^-^aV 



=[(9.8) (0.035) (l.S)"] 1/2 e [o.OS \ R / 



1 r ^- 4.5-3.0 rvon/ 



The value of — r — is p— j = 0.294 . 



To evaluate tanh [(h-d )/r| find 0.294 in column 4 of either Table C-1 or 



-1 r n 

 C-2, Appendix C, and read the value of tanh J (h-d )/R from column 3. 



Therefore 



tanh ^ (0.294) « 0.31 



The exponent is calculated thus ; 



0.217 (0.31) _ „ „, 

 (0:08^ °-^^ 



therefore 



Q = l.OSe °*^^ = 1.08 (0.43) = 0.47 m^/s-m 



or 3 



5.0 ft /s-ft 



For an onshore wind velocity of 35 mi/hr, the value of W^ is found by 

 interpolation 



30 mi/hr W^ = 0.5 



35 mi/hr W^ = 0.75 



60 mi/hr W^ = 2.0 



From equation (7-12) 



/h-d \ 

 k' = 1 + W^ I -^ + . 1 1 sin 



where 



"/ 



= 0.75 



h-d 



-^ = 0.3 



= tan "^ (1/2.5) - 22' 



sin 22°= 0.37 



7-57 



